In a recent lab test, photodynamic therapy killed 99.9 percent of the bacteria that cause gingivitis in -- 10 minutes. Clinical trials are scheduled for later this year.

• ”在最近的一次实验室测试中，光力学疗法在10分钟之内杀死了一种引起齿龈炎的病菌的”99.；9%25临床实验也定在今年的晚些时候进行。